The internet services company will be floating at between $10 and $12 a share, with Intel Capital among the backers looking to cash in.

Map shows some dark areas where Facebook has failed to penetrate, most notably China (where RenRen is dominant) and Russia.

FXall, the electronic trading platform formerly known as FX Alliance, which is backed by a range of financial services firms, will offer its shares at between $13.50 and $15.50 when it floats.

Pharmaceutical corporation Celgene has paid $350m upfront to acquire biopharma company Avila Therapeutics, with Novartis in line for an exit.

GlaxoSmithKline-backed ChemoCentryx is looking to raise up to $64m when it floats, hot on the heels of fellow biopharmaceutical company Verastem.

The social network continues its acquisition spree as it snaps up anti-malware service Dasient, landing an exit for Google Ventures

Verizon-backed loyalty platform CardStar is now part of email marketing company Constant Contact.

The biotechnology researcher, backed by a GlaxoSmithKline-linked venture capital firm, has set the range for its shares for its initial public offering at between $9 and $11.

Enobia has raised more than $145m from universities seed fund T2C2 (Technology, Transfer, Commercialisation, Capital) and venture capital firms.